TY  - JOUR
AU  - A. M. Tezin
TI  - Nontopological mapping of the phase plane in the qualitative theory of first order differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1972
SP  - 556
EP  - 558
VL  - 8
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1972_8_3_a23/
LA  - ru
ID  - DE_1972_8_3_a23
ER  -